fix: Soft breaks after text with comment mark does not work.

Note: This CSS was added waaaay back here: 2d5d5d3e4e
Since then the equivalent rule has moved to be more specific and this was vestigial.

closes #5119

shared/editor/components/Styles.ts

@@ -689,10 +689,6 @@ p {
   margin: 0;
   min-height: 1.6em;
 
-  span:first-child + br:last-child {
-    display: none;
-  }
-
   a {
     color: ${props.theme.text};
     text-decoration: underline;